JPH0639613B2 - Bottom blowing tuyere - Google Patents
Bottom blowing tuyereInfo
- Publication number
- JPH0639613B2 JPH0639613B2 JP16013189A JP16013189A JPH0639613B2 JP H0639613 B2 JPH0639613 B2 JP H0639613B2 JP 16013189 A JP16013189 A JP 16013189A JP 16013189 A JP16013189 A JP 16013189A JP H0639613 B2 JPH0639613 B2 JP H0639613B2
- Authority
- JP
- Japan
- Prior art keywords
- refractory
- gas
- metal
- impregnated
- brick
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000007664 blowing Methods 0.000 title claims description 23
- 239000011449 brick Substances 0.000 claims description 74
- 229910052751 metal Inorganic materials 0.000 claims description 41
- 239000002184 metal Substances 0.000 claims description 41
- 239000011819 refractory material Substances 0.000 claims description 10
- 239000007789 gas Substances 0.000 description 75
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 32
- 230000003628 erosive effect Effects 0.000 description 21
- 238000004901 spalling Methods 0.000 description 17
- 239000000395 magnesium oxide Substances 0.000 description 16
- 239000002893 slag Substances 0.000 description 14
- 238000005470 impregnation Methods 0.000 description 13
- 239000010935 stainless steel Substances 0.000 description 13
- 229910001220 stainless steel Inorganic materials 0.000 description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- 238000003756 stirring Methods 0.000 description 12
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 239000002994 raw material Substances 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
- 238000005452 bending Methods 0.000 description 5
- 239000000835 fiber Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 239000000112 cooling gas Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910017060 Fe Cr Inorganic materials 0.000 description 2
- 229910002544 Fe-Cr Inorganic materials 0.000 description 2
- 229910018487 Ni—Cr Inorganic materials 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 229910052596 spinel Inorganic materials 0.000 description 2
- 239000011029 spinel Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000011823 monolithic refractory Substances 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Manufacture And Refinement Of Metals (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、転炉底吹きなどに用いられるMHP方式の底吹
き羽口に関する。The present invention relates to a bottom blown tuyere of the MHP type used for bottom blowing of a converter.
例えば、転炉操業においては、ランスから酸素を吹付け
て吹錬を行ないつつ、転炉内の溶湯の撹拌力を向上させ
るため、炉底の底吹き羽口から撹拌ガスを溶湯に吹込む
いわゆる複合吹錬が行なわれている。For example, in converter operation, oxygen is blown from the lance to carry out blowing, and in order to improve the stirring power of the molten metal in the converter, so-called blowing a stirring gas into the molten metal from the bottom blowing tuyere of the furnace bottom. Combined blowing is taking place.
特開昭５８−０５８２１８号公報には転炉底吹きに用い
られる底吹き羽口が記載されている。底吹き羽口のガス
吹込み通路は単管または二重管で形成され、溶鋼を更に
撹拌するためにガス圧を高めると、羽口周辺の内張り耐
火物が激しく溶損するという難点があった。Japanese Patent Application Laid-Open No. 58-058218 describes a bottom blowing tuyere used for bottom blowing of a converter. The gas blowing passage of the bottom blown tuyere is formed by a single pipe or a double pipe, and if the gas pressure is increased in order to further stir the molten steel, there is a problem that the lining refractory around the tuyere is severely melted.
そこで、最近では羽口周辺の内張り耐火物の溶損を抑え
つつ、ガス圧を高めることができるマルチホールプラグ
方式の底吹き羽口（以下、単にMHPという）が用いられ
ている。Therefore, recently, a bottom blown tuyere (hereinafter, simply referred to as MHP) of a multi-hole plug system that can increase the gas pressure while suppressing the melting loss of the refractory lining around the tuyere is used.
ここで、MHPとは耐火物内にガス溜部（風箱）を埋設
し、ガス溜部に多数のガス吹込み通路を連通させた底吹
き羽口であり、ガス溜部における背圧によって、多重の
撹拌ガスや冷却ガスなどを高圧で転炉内溶鋼に吹込みで
きるものをいう。このMHPは従来の羽口と同様に転炉の
底部に設置され、転炉内の溶鋼と直接接触する面（以
下、稼働面という）を有している。また、転炉傾動時に
は、稼働面はスラグにも接触する。このため、MHPを形
成する耐火物（以下、ガス吹込みレンガという）の気孔
内に溶鋼やスラグ（以下、スラグ等という）が浸入し易
く、MHPは浸食および溶損を起し易すかった。Here, MHP is a bottom blowing tuyere in which a gas reservoir (wind box) is embedded in a refractory and a large number of gas injection passages are connected to the gas reservoir, and due to back pressure in the gas reservoir, It means that multiple stirring gas and cooling gas can be blown into molten steel in the converter at high pressure. Like the conventional tuyere, this MHP is installed at the bottom of the converter and has a surface that is in direct contact with the molten steel in the converter (hereinafter called the operating surface). Further, when the converter tilts, the operating surface also contacts the slag. For this reason, molten steel or slag (hereinafter referred to as slag) is easily infiltrated into the pores of the refractory (hereinafter referred to as gas-blowing brick) forming MHP, and MHP is likely to cause erosion and melting damage.
また、特に稼働面は激しく撹拌されている溶鋼流と直接
接触するため、溶鋼による物理的な摩耗が激しかった。Moreover, since the operating surface is in direct contact with the molten steel flow that is vigorously stirred, physical wear due to the molten steel was severe.
さらに、上述のガス供給管は、MHP本体の中央周辺部を
貫通して設けられているが、この供給管にガスを通気す
ると、その冷却作用により供給管を中心として放射状に
負の熱勾配が生じ、熱的スポーリングを起し易すかっ
た。それとは別に、稼働面側とその背面（すなわち、鉄
皮側）間にも熱勾配が生じるため、熱的スポーリングが
非常に起り易かった。Further, the gas supply pipe described above is provided so as to penetrate through the central peripheral portion of the MHP main body, but when gas is aerated through this supply pipe, a negative thermal gradient is generated radially around the supply pipe due to its cooling action. It was easy to cause thermal spalling. Apart from that, a thermal gradient also occurs between the working surface side and the back surface (that is, the iron skin side), so that thermal spalling was very easy to occur.
これらの理由から、MHPの寿命は２０００〜２３００Ｃ
Ｈ（約６７０〜７６０時間）であり、MHPの交換および
その周囲の補修を頻繁に行わなければならなかった。こ
のため、転炉の稼働率が低下し、製造コストが高くなる
という問題点があった。For these reasons, the life of MHP is 2000-2300C.
It was H (about 670 to 760 hours), and it was necessary to frequently replace the MHP and repair the surrounding area. Therefore, there is a problem that the operating rate of the converter decreases and the manufacturing cost increases.
上記問題点を解決するために種々の研究が為され、マグ
ネシア・ドロマイト質レンガ、マグネシア・クロム質レ
ンガなどの酸化物系耐火物、およびマグネシア・カーボ
ン質レンガ、マグネシア・カルシア・カーボン質レンガ
などの含炭素系耐火物で形成されたMHPが開発された。Various studies have been made to solve the above problems, oxide refractories such as magnesia dolomite bricks, magnesia chrome bricks, and magnesia carbon bricks, magnesia calcia carbon bricks, etc. MHPs made of carbon-containing refractories have been developed.
しかしながら、酸化物系耐火物で形成されたMHPは耐浸
食性は優れているものの、耐熱的スポーリング性が不十
分であった。また、一般に、酸化物系耐火物は多孔質で
あるためスラグが浸入しやすく、浸食や溶損が起り易
く、それに伴って構造的スポーリングを起すという欠点
があった。However, although the MHP formed of oxide refractory has excellent erosion resistance, it has insufficient heat-resistant spalling resistance. Further, in general, oxide refractories are porous, so that slag is likely to infiltrate, erosion and melting loss are likely to occur, and structural spalling is caused accordingly.
含炭素系耐火物で形成されたMHPは、酸化物系耐火物で
形成されたMHPより優れた耐熱的スポーリング性を有し
ているものの、未だ満足できる耐熱的スポーリング性は
得られておらず、ステンレス鋼性の撹拌ガス供給管の周
囲に厚さ１５乃至２０mmの断熱層を設ける必要があり、
MHPの内部構造が複雑になるという欠点があった。Although MHPs formed from carbon-containing refractories have superior heat-resistant spalling properties to MHPs formed from oxide-based refractories, satisfactory heat-resistant spalling properties have not yet been obtained. First, it is necessary to provide a heat insulating layer with a thickness of 15 to 20 mm around the stainless steel stirring gas supply pipe,
There was a drawback that the internal structure of the MHP became complicated.
加えて、含炭素系耐火物は含有炭素が酸化されてしま
い、耐火物自体が劣化し損壊してしまうという欠点があ
った。In addition, the carbon-containing refractory has a drawback that the carbon contained therein is oxidized and the refractory itself is deteriorated and damaged.
なお、上記いずれの耐火物も多孔質であるため、溶鋼流
による摩耗を十分に防止することは不可能だった。Since all of the above refractories are porous, it was impossible to sufficiently prevent wear due to the molten steel flow.
本発明は上記事情に鑑みてなされたものであり、耐スラ
グ浸食性、耐スポーリング性、および耐摩耗性に優れた
耐火物で形成されたMHPを提供することを目的とする。The present invention has been made in view of the above circumstances, and an object thereof is to provide an MHP formed of a refractory having excellent slag erosion resistance, spalling resistance, and wear resistance.
本発明の目的は、ガス供給管に連通されたガス溜部と、
前記ガス溜部に連通し、溶湯容器内に開口する多数のガ
ス吹込み通路が形成されたガス吹込みレンガと、これら
を包容するように形成された外装レンガとを有し、前記
ガス吹込みレンガが、耐火物の重量に対して金属を１〜
１００重量％の範囲内で種々の割合に含浸させた金属含
浸耐火レンガからなることを特徴とする底吹き羽口によ
って達成される。An object of the present invention is to provide a gas reservoir communicating with a gas supply pipe,
The gas injection brick has a gas injection brick in which a large number of gas injection passages that open to the inside of the molten metal container are formed in communication with the gas reservoir, and an exterior brick formed to include these gas injection bricks. Bricks have 1 to 1 metal to refractory weight
Achieved by a bottom blown tuyere characterized by consisting of metal-impregnated refractory bricks impregnated in various proportions within the range of 100% by weight.
さらに、前記ガス吹込みレンガが、ガス吹込み通路の開
口側の領域で、耐火物の重量に対して金属を１〜５０重
量％の範囲の割合で含浸させ、ガス溜部側の領域で耐火
物に対して金属を３０〜１００重量％の範囲の割合で含
浸させた金属含浸耐火レンガからなることを特徴とする
底吹き羽口によって達成される。Further, the gas-blowing brick impregnates the metal in the range of 1 to 50% by weight with respect to the weight of the refractory in the region on the opening side of the gas-blowing passage, and the refractory in the region on the gas reservoir side. It is achieved by a bottom-blown tuyere characterized by comprising a metal-impregnated refractory brick impregnated with a metal in a proportion in the range of 30 to 100% by weight.
なお、本発明の底吹き羽口は、転炉における燃焼ガス供
給用あるいは撹拌ガス供給用の羽口としてのみならず、
高炉などにも同様に用いることができる。The bottom blown tuyere of the present invention is not limited to the combustion gas supply or stirring gas supply tuyere in the converter,
It can also be used in a blast furnace or the like.
本発明の底吹き羽口は、その稼働面に金属含浸耐火物で
形成された耐火レンガを適用したものである。金属含浸
耐火物は、耐火物多孔体に金属を含浸させたものであ
り、その見掛け気孔率を通常の耐火物の見掛け気孔率よ
り小さくすることができる。したがって、スラグの浸入
によって生じる浸食や溶損を防ぐことができ、このため
耐構造的スポーリング性が向上する。The bottom blown tuyere of the present invention has a refractory brick formed of a metal-impregnated refractory applied to its operating surface. The metal-impregnated refractory is obtained by impregnating a refractory porous body with a metal, and its apparent porosity can be made smaller than that of a normal refractory. Therefore, it is possible to prevent erosion and melting loss caused by infiltration of slag, and thus structural spalling resistance is improved.
また、金属を含浸させることによって耐火物の熱伝導性
が向上するので熱分散性が良くなり、耐火物内外に温度
差が生じ難いので、熱膨脹差による歪みも生じ難い。こ
のため、耐熱的スポーリング性が向上する。Further, by impregnating the metal, the thermal conductivity of the refractory is improved, the heat dispersibility is improved, and the temperature difference between the inside and the outside of the refractory is unlikely to occur, so that the strain due to the difference in thermal expansion hardly occurs. Therefore, the heat resistant spalling property is improved.
さらに、金属を含浸させることによって耐火物密度が高
くなり耐摩耗性が向上する。Further, by impregnating the metal, the refractory density is increased and the wear resistance is improved.
このように、本発明に係わる底吹き羽口は、耐スラグ浸
食性、耐スポーリング性および耐摩耗性に優れているの
で、長期間の操業が可能となる。As described above, the bottom blown tuyere according to the present invention is excellent in slag erosion resistance, spalling resistance, and wear resistance, and thus can be operated for a long period of time.
以下、図面を参照しながら、本発明に係わる一実施例を
説明する。An embodiment according to the present invention will be described below with reference to the drawings.
第１図は、本発明に係わる底吹き羽口の縦断面図であ
る。FIG. 1 is a vertical sectional view of a bottom blown tuyere according to the present invention.
底吹き羽口１は、ガス供給管５を有するガス溜部２と、
多数のガス吹込み通路４を有する金属含浸耐火レンガ３
と、これらの外側を取囲むように形成された外装レンガ
７とを具備するものである。The bottom blown tuyere 1 includes a gas reservoir 2 having a gas supply pipe 5,
Metal-impregnated refractory brick 3 having a large number of gas injection passages 4
And an exterior brick 7 formed so as to surround these outsides.
金属含浸耐火レンガ３は耐火物多孔体に金属を含浸させ
たものであり、耐火物多孔体には、マグネシア質レン
ガ、マグネシア・クロム質レンガ、マグネシア・スピネ
ル質レンガ、アルミナ質レンガ、またはスピネル質レン
ガなどの焼成耐火物レンガを用いることをできる。The metal-impregnated refractory brick 3 is obtained by impregnating a refractory porous body with a metal, and the refractory porous body is made of magnesia brick, magnesia chrome brick, magnesia spinel brick, alumina brick, or spinel brick. Baking refractory bricks such as bricks can be used.
含浸させる金属は、ステンレス鋼、クロム、ニッケル、
アルミニウム、および鉄など、どのような金属でもよい
が、特にNi−Cr合金が好ましい。これらの金属はそれぞ
れ単独で、または組合せて前記耐火物多孔体に含浸させ
ることができる。The metals to be impregnated are stainless steel, chromium, nickel,
Any metal such as aluminum and iron may be used, but a Ni-Cr alloy is particularly preferable. These metals can be used alone or in combination to impregnate the refractory porous body.
前記金属の含浸量は、耐火物多孔体の重量に対して約１
〜１００重量％の範囲内で、所望の効果が得られるよう
に適宜選択する。特に、稼働面側の金属含浸量を約１〜
５０重量％にし、ガス溜部側の金属含浸量を３０〜１０
０重量％にするのが好ましい。ここで、稼働面側とは稼
働面からガス溜部までの間の約2/3の部分を言い、ガス
溜部側とはガス溜部上面から稼働面までの間の約1/3の
部分のことを言う。The amount of the metal impregnated is about 1 with respect to the weight of the refractory porous body.
The amount is appropriately selected within the range of ˜100% by weight so as to obtain a desired effect. Especially, the metal impregnation amount on the working surface side is about 1
50% by weight and the amount of metal impregnated on the gas reservoir side is 30 to 10
It is preferably 0% by weight. Here, the operating surface side refers to about 2/3 of the portion from the operating surface to the gas reservoir, and the gas reservoir side refers to about 1/3 of the portion from the top of the gas reservoir to the operating surface. Say that.
稼働面側において前記範囲内の金属含浸量が好ましいと
した理由は、稼働面側では耐浸食性や耐スポーリング性
などの性質が特に要求されるので、これらの性質を向上
させるためには最低でも約１重量％の金属含浸量が必要
であり、且つ耐火物の耐食性および耐スポーリング性を
維持しつつ含浸し得る最大量が約５０重量％だからであ
る。また、ガス溜部側において前記範囲内の金属含浸量
が好ましいとした理由は、ガス溜部上面は耐火部材３と
ガス溜部２とが溶接されるため、この溶接を容易に行う
ためには、最低でも約３０重量％の金属含浸量が必要で
あるからである。The reason why the metal impregnation amount within the above range is preferable on the operating surface side is that properties such as erosion resistance and spalling resistance are particularly required on the operating surface side. However, a metal impregnation amount of about 1% by weight is required, and the maximum amount that can be impregnated while maintaining the corrosion resistance and spalling resistance of the refractory is about 50% by weight. The reason why the amount of metal impregnation within the above range is preferable on the gas reservoir side is that the refractory member 3 and the gas reservoir 2 are welded to each other on the upper surface of the gas reservoir. This is because a metal impregnation amount of at least about 30% by weight is required.
なお、金属含浸量１００重量％とは金属のみで形成され
ていることを意味しており、耐火部材３とガス溜部２と
の溶接を容易に行うためには、耐火部材３の下面（すな
わち、ガス溜部２との接触面）は金属のみで形成されて
いるのが特に好ましい。The metal impregnation amount of 100% by weight means that the metal impregnation amount is made of only metal, and in order to easily weld the refractory member 3 and the gas reservoir 2, the lower surface of the refractory member 3 (that is, It is particularly preferable that the contact surface with the gas reservoir 2) is made of only metal.
この金属含浸耐火レンガ３には、内径０．５〜５mmのガ
ス吹込み通路４が多数穿孔されている。ここで特筆すべ
きことは、金属含浸耐火レンガ３は優れた耐火物特性を
有している、ガス吹込み通路４にステンレス鋼管を用い
る必要がなく、単なる貫通孔で十分であるということで
ある。このように、ガス吹込み通路４ステンレス鋼管を
用いる必要がないため、MHPの内部構造をできる限り単
純にすることができる。In this metal-impregnated refractory brick 3, a large number of gas blowing passages 4 having an inner diameter of 0.5 to 5 mm are perforated. What is noteworthy here is that the metal-impregnated refractory brick 3 has excellent refractory properties, it is not necessary to use a stainless steel pipe for the gas blowing passage 4, and a mere through hole is sufficient. . As described above, since it is not necessary to use the gas injection passage 4 stainless steel pipe, the internal structure of the MHP can be made as simple as possible.
ガス溜部２は、ステンレス鋼で形成されたガス収容容器
である。このガス溜部２はガス供給管５を有しており、
このガス供給管５はガス管６と接続している。通常、ガ
ス供給管には、ステンレス鋼管が用いられている。撹拌
ガスや冷却ガスなどのガスは、ガス管６およびガス供給
管５を介してガス溜部２に収容される。ガス溜部２に収
容されたガスは、ガス吹込み通路４を介して転炉内に噴
射される。一般に、撹拌ガスには酸素ガス、アルゴンガ
ス、窒素ガス、または二酸化炭素ガスなどが用いられ、
冷却ガスには天然ガス、ブタンガス、またはプロパンガ
スなどの炭化水素ガスが用いられる。The gas reservoir 2 is a gas storage container made of stainless steel. This gas reservoir 2 has a gas supply pipe 5,
The gas supply pipe 5 is connected to the gas pipe 6. Normally, a stainless steel pipe is used as the gas supply pipe. Gases such as stirring gas and cooling gas are stored in the gas reservoir 2 via the gas pipe 6 and the gas supply pipe 5. The gas contained in the gas reservoir 2 is injected into the converter via the gas injection passage 4. Generally, oxygen gas, argon gas, nitrogen gas, carbon dioxide gas or the like is used as the stirring gas,
Hydrocarbon gas such as natural gas, butane gas, or propane gas is used as the cooling gas.
このようにして構成されたMHPを、従来の羽口と同様
に、転炉等の底部に設置する。通常、MHPは転炉等の垂
直中心軸に対して平行に取付けるが、より良い撹拌効率
を得るために傾斜させて取付けることもできる。転炉に
溶鉄が装入されたら、撹拌ガス等をガス吹込み通路を介
して炉内の溶鋼に吹込む。撹拌ガスなどの供給は、ガス
供給手段（図示せず）によって行なわれる。ガスが供給
される際のガス圧は、所望の撹拌状態が得られるように
適宜調節すればよい。しかし、溶鉄が羽口稼働面を浸漬
している場合、ガス吹込み通路への溶鋼浸入を防止する
ために、溶鋼の静圧よりも大きいガス圧を印加する必要
がある。The MHP configured in this way is installed at the bottom of a converter or the like, similar to a conventional tuyere. Normally, the MHP is mounted parallel to the vertical center axis of the converter or the like, but it can be mounted at an angle to obtain better stirring efficiency. After the molten iron is charged into the converter, stirring gas or the like is blown into the molten steel in the furnace through the gas blowing passage. The stirring gas or the like is supplied by a gas supply means (not shown). The gas pressure when the gas is supplied may be appropriately adjusted so as to obtain a desired stirring state. However, when the molten iron immerses the tuyere operating surface, it is necessary to apply a gas pressure higher than the static pressure of the molten steel in order to prevent the molten steel from entering the gas blowing passage.
本発明の底吹き羽口の製造方法は特に限定されないが、
例えば以下の方法を用いることができる。The manufacturing method of the bottom blown tuyere of the present invention is not particularly limited,
For example, the following method can be used.
まず初めに、前記耐火物レンガの耐火性原料およびバイ
ンダー等を金型に充填して圧力を印加し、矩形型の耐火
物レンガを製造する。耐火物原料を金型に充填する際
に、所望の見掛け気孔率を得るために、所定の焼成で焼
失する繊維（例えば、麻や綿糸など）を適量添加する。
繊維を添加する際、ある部分の繊維添加量を多くし、他
の部分の繊維添加量を少なくすることによって、一体の
耐火物多孔体内で異なった見掛け気孔率を有する部分を
作ることができる。また、添加する繊維の径を変化させ
ることによって行うこともできる。First, a mold is filled with the refractory raw material of the refractory brick, a binder and the like, and pressure is applied to manufacture a rectangular refractory brick. When the mold is filled with the refractory raw material, an appropriate amount of fibers (for example, hemp and cotton yarn) that are burnt down by predetermined firing is added in order to obtain a desired apparent porosity.
When the fibers are added, by increasing the amount of the fibers added to one part and decreasing the amount of the fibers added to the other part, it is possible to form parts having different apparent porosities in the single refractory porous body. It can also be performed by changing the diameter of the fiber to be added.
このように一体の耐火物多孔体であって異なった見掛け
気孔率を有する部分を持つ耐火物多孔体を得ることによ
り、一体の金属含浸耐火物であって異なった金属含浸量
を有する金属含浸耐火物多孔体を得ることができるので
ある。In this way, by obtaining a porous refractory body having a portion having different apparent porosities, which is a monolithic refractory body, it is possible to obtain a monolithic metal-impregnated refractory body having different metal impregnation amounts. A porous material can be obtained.
所望の見掛け気孔率に調節された耐火物多孔体を、約１
４００〜１７００℃に予熱し脱気する。次いで、所望の
溶融金属に浸漬し、圧力（３〜９kg/cm2）を印加する。The refractory porous body adjusted to the desired apparent porosity is about 1
Preheat to 400 to 1700 ° C and degas. Then, it is immersed in a desired molten metal and pressure (3 to 9 kg / cm 2 ) is applied.
このようにして、耐火物多孔体に金属を含浸させた金属
含浸耐火レンガを製造することができる。例えば、見掛
け気孔率が４０容積％に調節され、縦が１０cmで、横が
１３cmで、高さが１２０cmである耐火物多孔体に約４５
重量％のNiを含浸させることができる。また、見掛け気
孔率が３０容積％に調節され、縦が５cmで、横が５cm
で、高さが９０cmである耐火物多孔体に約３６重量％の
Ni−Crを含浸させることができる。In this way, a metal-impregnated refractory brick obtained by impregnating a refractory porous body with a metal can be manufactured. For example, the apparent porosity is adjusted to 40% by volume, and the length is 10 cm, the width is 13 cm, and the height is 120 cm.
It can be impregnated with wt% Ni. In addition, the apparent porosity is adjusted to 30% by volume, the length is 5 cm and the width is 5 cm.
And the refractory porous body with a height of 90 cm contains about 36% by weight.
It can be impregnated with Ni-Cr.
このようにして製造された金属含浸耐火レンガに多数の
細孔を穿孔し、ガス供給通路４を形成することによっ
て、金属含浸耐火レンガ３を製造することができる。The metal-impregnated refractory brick 3 can be manufactured by forming a large number of pores in the metal-impregnated refractory brick thus manufactured and forming the gas supply passage 4.
得られた金属含浸耐火レンガ３をステンレス鋼製のガス
溜部２の上面と溶接する。溶接する手段は従来の方法に
よる。金属含浸耐火レンガ３の金属含浸量は、特にガス
溜部と溶接される耐火物領域において高く調製されてい
るので、溶接を容易且つ確実に行うことができる。The obtained metal-impregnated refractory brick 3 is welded to the upper surface of the gas reservoir 2 made of stainless steel. The means for welding is conventional. Since the metal impregnation amount of the metal-impregnated refractory brick 3 is adjusted to be particularly high in the refractory region to be welded to the gas reservoir, the welding can be performed easily and reliably.
ガス溜部２が溶接された金属含浸耐火レンガ３を、マグ
ネシア・クロム質等の前記耐火物原料と共に羽口成形用
金型に装入し、圧力（１００〜１０００kg/cm2）を印加
して羽口成形体を得る。但し、金属含浸体のみで形成さ
れたものでもよい。The metal-impregnated refractory brick 3 to which the gas reservoir 2 is welded is charged into the tuyere forming mold together with the refractory raw material such as magnesia and chrome, and pressure (100 to 1000 kg / cm 2 ) is applied. Obtain a tuyere molding. However, it may be formed of only the metal impregnated body.
得られた羽口成形体は、研磨加工などによって所望の形
状に整形される。The obtained tuyere molding is shaped into a desired shape by polishing or the like.
以下、金属含浸耐火レンガ３の種々の耐火物試験の結果
について説明する。The results of various refractory tests on the metal-impregnated refractory brick 3 will be described below.
耐浸食性 上述した方法により、マグネシア・クロム質耐火物原料
を成形し耐火物多孔体を得、この耐火物多孔体重量に対
して、金属含浸量を０〜８０重量％の範囲内で変化させ
て５０Ni−５０Crを含浸させ、種々の金属含浸量を有す
る金属含浸耐火レンガを得た。Erosion resistance By the above-mentioned method, a magnesia / chromic refractory raw material is molded to obtain a refractory porous body, and the metal impregnation amount is changed within the range of 0 to 80% by weight based on the weight of the refractory porous body. And 50Ni-50Cr were impregnated to obtain metal-impregnated refractory bricks having various metal impregnation amounts.
この金属含浸耐火レンガを溶鋼およびスラグに１０時間
暴露して、スラグによる浸食の程度（以下、浸食指数と
いう）を調べた。This metal-impregnated refractory brick was exposed to molten steel and slag for 10 hours, and the degree of erosion by the slag (hereinafter referred to as erosion index) was examined.
なお、比較耐火レンガとして、金属を含浸させていない
マグネシア・クロム質耐火レンガも同様にスラグ等に暴
露し、スラグによる浸食を調べた。この結果を第２図に
示した。ここで、浸食指数とは、前記比較耐火レンガの
浸食の程度を基準（100）として、５０Ni−５０Crを含
浸させた金属含浸耐火レンガの浸食の程度を表わしたも
のである。すなわち、浸食指数が１００未満のときは、
５０Ni−５０Crを含浸させたことにより浸食が抑制され
たことを示す。As a comparative refractory brick, magnesia / chromic refractory brick not impregnated with metal was similarly exposed to slag and the like, and erosion due to slag was examined. The results are shown in FIG. Here, the erosion index represents the degree of erosion of the metal-impregnated refractory brick impregnated with 50Ni-50Cr, based on the degree of erosion of the comparative refractory brick (100). That is, when the erosion index is less than 100,
It shows that erosion was suppressed by impregnating with 50Ni-50Cr.
第２図から明らかな通り、５０Ni−５０Crを含浸させる
ことにより、スラグ等による浸食が抑制された。As is clear from FIG. 2, by impregnating with 50Ni-50Cr, erosion due to slag or the like was suppressed.
耐熱的スポーリング性 耐スポール性 上述した方法により、マグネシア質耐火物原料を成形し
耐火物多孔体を得、この耐火物多孔体重量に対して、Al
を２０重量％および４０重量％含浸させ、金属含浸耐火
レンガを製造した。この金属含浸耐火レンガをそれぞれ
所定の温度（100℃ごと）まで加熱し、その後水中で急
冷して強度を測定した。得られた各々の強度を、加熱急
冷前の強度で除して強度指数を算出した。この強度指数
と急冷温度差（ΔＴ）との関係を第３図に示した。ここ
で、白三角はAlを４０重量％含浸させた金属含浸耐火レ
ンガの結果を、黒丸はAlを２０重量％含浸させた金属含
浸耐火レンガの結果を示している。なお、白丸は比較耐
火レンガであるマグネシア質耐火レンガの結果を示して
いる。Heat-resistant spalling resistance Spall resistance By the method described above, a magnesia refractory raw material was molded to obtain a refractory porous body.
Was impregnated with 20% by weight and 40% by weight to produce a metal-impregnated refractory brick. Each of the metal-impregnated refractory bricks was heated to a predetermined temperature (every 100 ° C.) and then rapidly cooled in water to measure the strength. Each strength thus obtained was divided by the strength before heating and quenching to calculate a strength index. The relationship between this strength index and the quenching temperature difference (ΔT) is shown in FIG. Here, the white triangles show the results of the metal-impregnated refractory bricks impregnated with Al 40% by weight, and the black circles show the results of the metal-impregnated refractory bricks impregnated with Al 20% by weight. The white circles indicate the results of the magnesia refractory brick, which is a comparative refractory brick.
第３図によると、比較耐火レンガは温度差が約１００℃
になると強度の低下が認められる。これに対し、Alを２
０重量％含浸させた金属含浸耐火レンガは温度差が約３
００℃まで、また４０重量％含浸させた金属含浸耐火レ
ンガは温度差が約７００℃までは、室温時と同等の強度
を有することがわかった。According to FIG. 3, the temperature difference of the comparative refractory brick is about 100 ° C.
Then, a decrease in strength is recognized. In contrast, Al is 2
The temperature difference of the metal-impregnated refractory brick impregnated with 0% by weight is about 3
It has been found that the metal-impregnated refractory brick impregnated up to 00 ° C. and 40 wt% has the same strength as at room temperature up to a temperature difference of up to about 700 ° C.
曲げ強度試験 上述の方法で、マグネシア質耐火レンガにFeを１５重量
％および３０重量％含浸させた金属含浸耐火レンガを製
造した。この金属含浸耐火レンガを徐々に加熱し、耐火
物温度が２００℃上昇することに曲げ強度を測定した。
この曲げ強度と加熱温度との関係を第４図に示した。こ
の図において、白三角はFeを３０重量％含浸させた金属
含浸耐火レンガの結果を、黒丸はFeを１５重量％含浸さ
せた金属含浸耐火レンガの結果を示している。なお、白
丸は比較耐火レンガであるマグネシア質耐火レンガの結
果を示している。Bending Strength Test Metal-impregnated refractory bricks were produced by impregnating magnesia refractory bricks with Fe at 15 wt% and 30 wt% by the method described above. This metal-impregnated refractory brick was gradually heated, and the bending strength was measured while the refractory temperature increased by 200 ° C.
The relationship between the bending strength and the heating temperature is shown in FIG. In this figure, the white triangles show the results of the metal-impregnated refractory bricks impregnated with 30 wt% Fe, and the black circles show the results of the metal-impregnated refractory bricks impregnated with 15 wt% Fe. The white circles indicate the results of the magnesia refractory brick, which is a comparative refractory brick.
第４図から明らかな通り、比較耐火レンガの曲げ強度と
比べ、Feを含浸させた金属含浸耐火レンガの曲げ強度は
高いことがわかった。As is clear from FIG. 4, the bending strength of the metal-impregnated refractory brick impregnated with Fe was higher than that of the comparative refractory brick.
以上、本発明の底吹き羽口に用いられる金属含浸耐火レ
ンガは、スラグ等による浸食を低減させることができ
る。また、従来の耐火レンガと比べ高温時における強度
および曲げ強度の低下が抑制されるので耐スポーリング
性および耐摩耗性が向上する。したがって、この金属含
浸耐火レンガを稼働面に取付けることによって、本発明
の底吹き羽口の耐浸食性および耐スポーリングが向上す
ることが期待できる。As described above, the metal-impregnated refractory brick used for the bottom blown tuyere of the present invention can reduce erosion due to slag or the like. Further, as compared with the conventional refractory brick, the decrease in strength and bending strength at high temperature is suppressed, so that spalling resistance and wear resistance are improved. Therefore, by attaching this metal-impregnated refractory brick to the working surface, it can be expected that the erosion resistance and spalling resistance of the bottom blown tuyere of the present invention are improved.
以下、金属含浸耐火レンガを具備した底吹き羽口（MH
P）を実際に製造し、転炉に用いた実施例を挙げる。Below, bottom blown tuyere equipped with metal impregnated refractory brick (MH
An example in which P) was actually manufactured and used in a converter is given below.
（実施例１） 上述した方法より縦３０cm×横４０cm×高さ６０cmのマ
グネシア質耐火物成形体を製造した。この耐火物成形体
の見掛け気孔率は、稼働面から約４０cmまでの部分が２
０容積％、その他の部分が５０容積％に調節されてい
る。Example 1 A magnesia refractory molded body having a length of 30 cm, a width of 40 cm and a height of 60 cm was manufactured by the method described above. The apparent porosity of this refractory compact is 2 from the working surface to about 40 cm.
0% by volume and other parts are adjusted to 50% by volume.
この耐火物多孔体を１６００℃に予熱し、ステンレス溶
湯に浸漬した。次いで、４．０kg/cm2の圧力を印加し、
稼働面から約４０cmまでの部分にステンレスが２９重量
％、その他の部分にはステンレスが５２重量％含浸した
金属含浸耐火レンガを製造した。その後、内径０．５mm
のガス供給通路を穿孔し、金属含浸耐火レンガの金属含
浸量が多い面をガス溜部（ステンレス製）に溶接した。
これをマグネシア-カーボン質耐火物原料と共に羽口用
金型に装入し、1000kg/cm2の圧力を印加してMHPを製造
した。This porous refractory material was preheated to 1600 ° C. and immersed in a molten stainless steel. Then, apply a pressure of 4.0 kg / cm 2 ,
A metal-impregnated refractory brick in which 29% by weight of stainless steel was impregnated in a portion up to about 40 cm from the working surface and 52% by weight of stainless steel was impregnated in other portions was manufactured. After that, the inner diameter is 0.5 mm
The gas supply passage was drilled, and the surface of the metal-impregnated refractory brick with a large amount of metal impregnation was welded to the gas reservoir (made of stainless steel).
This was charged into a tuyere mold together with a magnesia-carbonaceous refractory raw material, and a pressure of 1000 kg / cm 2 was applied to produce an MHP.
得られたMHPを転炉底部に設置し、その寿命を測定し
た。MHPの寿命は３５cm損耗したとき終了したと判断し
た。The obtained MHP was installed at the bottom of the converter and its life was measured. The life of the MHP was judged to have ended when it had worn out by 35 cm.
このMHPの寿命は、７００時間であった。The life of this MHP was 700 hours.
（実施例２） 上述した方法より、縦５０cm×横５０cm×高さ６０cmの
マグネシア・クロム質耐火物成形体を製造した。この耐
火物成形体の見掛け気孔率は、稼働面から約４０cmまで
の部分が３０容積％、その他の部分が６０容積％に調節
されている。Example 2 A magnesia / chromium refractory molded body having a length of 50 cm, a width of 50 cm and a height of 60 cm was manufactured by the method described above. The apparent porosity of this refractory molded body is adjusted to 30% by volume in the portion up to about 40 cm from the working surface and 60% by volume in the other portions.
この耐火物多孔体を１５００℃に予熱し、Fe−Cr溶湯に
浸漬した。次いで、７．０kg/cm2の圧力を印加し、稼働
面から約４０cmまでの部分にFe−Crが３８重量％、その
他の部分にはF-Crが５７重量％含浸した金属含浸耐火レ
ンガを製造した。その後、内径１．０mmのガス供給通路
を穿孔し、金属含浸耐火レンガの金属含浸量が多い面を
ガス溜部（ステンレス製）に溶接しMHPを製造した。This refractory porous body was preheated to 1500 ° C. and immersed in the Fe—Cr molten metal. Then, a pressure of 7.0 kg / cm 2 was applied, and a metal-impregnated refractory brick impregnated with 38 wt% of Fe-Cr in the portion up to about 40 cm from the working surface and 57 wt% of F-Cr in the other portions. Manufactured. After that, a gas supply passage having an inner diameter of 1.0 mm was perforated, and the surface of the metal-impregnated refractory brick having a large amount of metal impregnation was welded to the gas reservoir (made of stainless steel) to produce MHP.
得られたMHPを転炉炉底部に設置し寿命を測定した。こ
のMHPの寿命は６５０時間であった。The obtained MHP was installed at the bottom of the converter and the life was measured. The life of this MHP was 650 hours.
（比較例） マグネシア−カーボン質耐火物の原料を内径１．０mmの
ステンレス管と風箱の囲りに充填し、2000kg/cm2の圧力
を印加し、５０φ×６０cmのMHPを製造した。このMHPの
見掛け気孔率は、５．０vol％である。(Comparative Example) A raw material of a magnesia-carbonaceous refractory material was filled in a stainless steel tube having an inner diameter of 1.0 mm and an enclosure of a wind box, and a pressure of 2000 kg / cm 2 was applied to manufacture an MHP of 50φ × 60 cm. The apparent porosity of this MHP is 5.0 vol%.
得られたMHPを転炉底部に設置し、その寿命を測定し
た。The obtained MHP was installed at the bottom of the converter and its life was measured.
このMHPの寿命は、４００時間であった。The life of this MHP was 400 hours.
上述の通り、本発明の底吹き羽口の寿命は従来の底吹き
羽口と比べて延長されていることがわかった。これは、
稼働面に金属含浸耐火レンガを適用することにより、耐
浸食性、耐スポーリング性、および耐摩耗性が総合的に
向上するためである。As mentioned above, it has been found that the life of the bottom-blown tuyere of the present invention is extended compared to the conventional bottom-blown tuyere. this is,
By applying the metal-impregnated refractory brick to the working surface, the erosion resistance, the spalling resistance, and the wear resistance are comprehensively improved.
本発明によれば、スラグによる浸食が低減され且つ耐ス
ポーリング性に優れた底吹き羽口が提供される。本発明
の底吹き羽口は長期操業が可能であり、この底吹き羽口
を用いることにより転炉などの稼働率を挙げることがで
きるので、製造コストを小さくすることができる。According to the present invention, there is provided a bottom blown tuyere in which erosion due to slag is reduced and which is excellent in spalling resistance. The bottom blown tuyere of the present invention can be operated for a long period of time, and by using this bottom blown tuyere, the operating rate of a converter or the like can be increased, so that the manufacturing cost can be reduced.
第１図は、本発明の一実施例に係る底吹き羽口を示す縦
断面図。 第２図ないし第４図は、本発明の実施例の効果を示した
グラフ図。 １……底吹き羽口（MHP）、２……ガス溜部、３……金
属含浸耐火レンガ、４……ガス吹込み通路。FIG. 1 is a vertical cross-sectional view showing a bottom blown tuyere according to an embodiment of the present invention. 2 to 4 are graphs showing the effects of the embodiment of the present invention. 1 ... Bottom blowing tuyere (MHP), 2 ... Gas reservoir, 3 ... Metal impregnated refractory brick, 4 ... Gas blowing passage.
Claims (2)
ガス溜部に連通し、溶湯容器内に開口する多数のガス吹
込み通路が形成されたガス吹込みレンガと、これらを包
含するように形成された外装レンガとを有し、少なくと
も前記ガス吹込みレンガが、耐火物の重量に対して金属
を１〜１００重量％の範囲内で種々の割合に含浸させた
金属含浸耐火レンガからなることを特徴とする底吹き羽
口。1. A gas reservoir part communicating with a gas supply pipe, a gas blowing brick having a large number of gas blowing passages communicating with the gas reservoir part and opening into a molten metal container, and these are included. And an exterior brick formed so that at least the gas-blown brick is impregnated with metal in various proportions within a range of 1 to 100% by weight with respect to the weight of the refractory material. Bottom blown tuyere characterized by consisting of.
の開口側の領域で、耐火物の重量に対して金属を１〜５
０重量％の範囲の割合で含浸させ、ガス溜部側の領域で
耐火物に対して金属を３０〜１００重量％の範囲の割合
で含浸させた金属含浸耐火レンガからなることを特徴と
する請求項１記載の底吹き羽口。2. The gas-blowing brick has a metal content of 1 to 5 relative to the weight of the refractory material in a region on the opening side of the gas-blowing passage.
It consists of a metal-impregnated refractory brick impregnated with a ratio of 0% by weight, and a metal is impregnated with a ratio of 30 to 100% by weight to the refractory in the region on the gas reservoir side. Item 1. The bottom-blown tuyere of item 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16013189A JPH0639613B2 (en) | 1989-06-22 | 1989-06-22 | Bottom blowing tuyere |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16013189A JPH0639613B2 (en) | 1989-06-22 | 1989-06-22 | Bottom blowing tuyere |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0324219A JPH0324219A (en) | 1991-02-01 |
| JPH0639613B2 true JPH0639613B2 (en) | 1994-05-25 |
Family
ID=15708542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16013189A Expired - Lifetime JPH0639613B2 (en) | 1989-06-22 | 1989-06-22 | Bottom blowing tuyere |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0639613B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107075596B (en) * | 2015-10-07 | 2018-10-02 | 东京窑业株式会社 | Bottom blowing plug |
| WO2017103959A1 (en) * | 2015-12-17 | 2017-06-22 | 東京窯業株式会社 | Bottom-blowing plug with improved workability |
| CN108728666B (en) * | 2018-07-25 | 2023-09-22 | 河南中原黄金冶炼厂有限责任公司 | Gland type smelting furnace |
-
1989
- 1989-06-22 JP JP16013189A patent/JPH0639613B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0324219A (en) | 1991-02-01 |
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